#include <bits/stdc++.h> using namespace std; #define ll long long #define ull unsigned long long #define ld long double #define bigint __int128 #define emb emplace_back #define pb push_back #define pii pair <int, int> #define fi first #define se second #define all(v) v.begin(), v.end() #define Task "" #define MASK(k) (1ull << k) #define bitcnt(k) __builtin_popcount(k) #define testBit(n, k) ((n >> k) & 1) #define flipBit(n, k) (n ^ (1ll << k)) #define offBit(n, k) (n & ~MASK(k)) #define onBit(n, k) (n | (1ll << k)) template <class T> bool minimize(T &a, T b) {if (a > b) {a = b; return true;} return false;} template <class T> bool maximize(T &a, T b) {if (a < b) {a = b; return true;} return false;} const int N = 2e5 + 5, lim = 60, mod = 1e9 + 7; const ll INF = 1e18; int n, h[N], a[N], b[N]; namespace sub2 { const int N = 2e3 + 5; int res[N][N]; void solve() { memset(res, -1, sizeof res); for (int u = 1; u <= n; u++) { for (int v = u + a[u]; v <= min(n, u + b[u]); v++) { if (v - b[v] <= u && u <= v - a[v]) res[u][v] = abs(h[u] - h[v]); } } for (int u = n; u > 0; u--) { for (int v = u + 1; v <= n; v++) { maximize(res[u][v], max(res[u + 1][v], res[u][v - 1])); } } int q; cin >> q; while (q--) { int l, r; cin >> l >> r; cout << res[l][r] << '\n'; } } } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); if (fopen(Task".inp", "r")) { freopen(Task".inp", "r", stdin); freopen(Task".out", "w", stdout); } cin >> n; for (int i = 1; i <= n; i++) cin >> h[i] >> a[i] >> b[i]; sub2::solve(); }

antennas.cpp: In function 'int main()':
antennas.cpp:62:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |                 freopen(Task".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
antennas.cpp:63:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |                 freopen(Task".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~